@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  --bg-primary: #07090e;
  --bg-surface: #0e131f;
  --bg-elevated: #151d2e;
  --bg-subtle: #1c263c;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(56, 189, 248, 0.4);
  --border-highlight: rgba(255, 255, 255, 0.16);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-accent: #38bdf8;

  --accent-cyan: #38bdf8;
  --accent-blue: #0284c7;
  --accent-emerald: #10b981;
  --accent-indigo: #6366f1;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Plus Jakarta Sans', var(--font-sans);
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --transition-fast: 0.15s ease;
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --max-width: 1200px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  color-scheme: dark;
  background-color: var(--bg-primary);
}

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Background Atmosphere */
.bg-glow {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at 50% -10%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* Layout Utilities */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

section {
  padding: 96px 0;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background-color: rgba(7, 9, 14, 0.75);
  border-bottom: 1px solid var(--border-subtle);
  transition: border-color var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #000;
  font-weight: 900;
  font-size: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-smooth);
}

.btn-primary {
  background-color: var(--accent-cyan);
  color: #000;
}

.btn-primary:hover {
  background-color: #7dd3fc;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border-highlight);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
}

/* Hero Section */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-emerald);
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  max-width: 900px;
  margin: 0 auto 24px;
  line-height: 1.1;
}

.hero-title span {
  color: var(--accent-cyan);
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 36px;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.quick-install-box {
  max-width: 580px;
  margin: 0 auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.code-snippet {
  overflow-x: auto;
  white-space: nowrap;
  color: #e2e8f0;
}

.copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.copy-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-elevated);
}

/* Hero Showcase Frame */
.hero-preview {
  margin-top: 56px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-highlight);
  background-color: var(--bg-surface);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  overflow: hidden;
  position: relative;
}

.preview-bar {
  height: 40px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--border-highlight);
}

.preview-img {
  width: 100%;
  height: auto;
  display: block;
}

/* Feature Grid */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.75rem);
  margin-bottom: 16px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.feature-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition-smooth);
}

.feature-card:hover {
  border-color: var(--border-highlight);
  background-color: var(--bg-elevated);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Interactive Tabs Section */
.tabs-container {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.tabs-nav {
  display: flex;
  border-bottom: 1px solid var(--border-subtle);
  background-color: rgba(14, 19, 31, 0.6);
  overflow-x: auto;
}

.tab-btn {
  padding: 18px 28px;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
  background-color: rgba(56, 189, 248, 0.04);
}

.tab-pane {
  display: none;
  padding: 48px;
}

.tab-pane.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 900px) {
  .tab-pane.active {
    grid-template-columns: 1fr;
    padding: 24px;
  }
}

.tab-info h3 {
  font-size: 1.75rem;
  margin-bottom: 16px;
}

.tab-info p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 24px;
}

.tab-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tab-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.tab-list svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
  margin-top: 4px;
}

.tab-visual {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-highlight);
  overflow: hidden;
}

.tab-visual img {
  width: 100%;
  height: auto;
  display: block;
}

/* Keybindings Cheatsheet Search */
.cheatsheet-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 32px;
}

.search-bar {
  width: 100%;
  padding: 14px 20px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 1rem;
  margin-bottom: 24px;
  transition: border-color var(--transition-fast);
}

.search-bar:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.keybind-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.keybind-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.keybind-action {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.kbd-group {
  display: flex;
  align-items: center;
  gap: 4px;
}

kbd {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Installation Steps */
.step-card {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
}

.step-num {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  padding: 64px 0 32px;
  background-color: var(--bg-surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.footer-col h4 {
  font-size: 1rem;
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex-wrap: wrap;
  gap: 16px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--bg-elevated);
  border: 1px solid var(--border-highlight);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-smooth);
  z-index: 1000;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}